50M56-743
Integrated Single or Two-Stage
HSI Integrated Furnace Control Kit
INSTALLATION INSTRUCTIONS
DESCRIPTION
The 50M56-743 kit is an automatic gas HSI Integrated Fur-
nace Control that employs a microprocessor to continually
monitor, analyze, and control the proper operation of the gas
burner, inducer, and fan.
Signals interpreted during continual surveillance of the ther-
mostat and flame sensing element initiate automatic ignition
of the burner, sensing of the flame, and system shut-off during
normal operation.
These controls incorporate system fault analysis for quick gas
flow shut-off, coupled with automatic ignition retry upon sensing
a fault correction.
Installation should be done by a qualified heating and air
conditioning contractor or licensed electrician.
If in doubt about whether your wiring is millivolt, line, or low
voltage, have it inspected by a qualified heating and air
conditioning contractor or licensed electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes
and ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could
cause the control to malfunction.
Following installation or replacement, follow manufacturer’s
recommended installation/service instructions to ensure
proper operation.
PRECAUTIONS
CAUTION
!
Do not short out terminals on gas valve or primary
control. Short or incorrect wiring may damage the
thermostat.
Failure to comply with the following warnings could result
in personal injury or property damage.
FIRE HAZARD
• Donotexceedthespeciedvoltage.
• Replaceexistingcontrolwithexactmodeland
dash number.
• Protectthecontrolfromdirectcontactwithwater
(dripping, spraying, rain, etc.).
• Ifthecontrolhasbeenindirectcontactwith
water, replace the control.
• Labelallwiresbeforedisconnectionwhen
servicing controls. Wiring errors can cause
improper and dangerous operation.
• Routeandsecurewiringawayfromame.
SHOCK HAZARD
• Disconnectelectricpowerbeforeservicing.
• Ensureproperearthgroundingofappliance.
• Ensureproperconnectionoflineneutralandline
hot wires.
EXPLOSION HAZARD
• Shutoffmaingastoapplianceuntilinstallation
is complete.
WARNING
!
CONTENTS
Description ................................................................... 1
Precautions .................................................................. 1
Specifications .............................................................. 2
Installation ................................................................... 3
Mounting & Wiring
Operation ..................................................................... 6
System Lockout and Diagnostic Features ................... 7
Troubleshooting ........................................................... 8
www.white-rodgers.com
www.emersonclimate.com
PART NO. 37-7474A
1314
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
Operator:Savetheseinstructionsforfutureuse!
50M56-743CrossReferenceInformation
Goodman White-Rodgers
0130F00006 PCBBF122 50M56 289
0130F00006S PCBBF122S
PCB00109 PCBBF132
PCBBF109 PCBBF132S
2
SPECIFICATIONS
ELECTRICAL RATINGS [@ 77°F (25°C)]:
Input Voltage: 25 VAC 50/60 Hz
Max.InputCurrent@25VAC: 0.45 amp
Relay Load Ratings:
Valve Relay: 1.5 amp @ 25 VAC 50/60 Hz 0.6 pf
Ignitor Relay: 6.0 amp @ 120 VAC 50/60 Hz (resistive)
Inducer Relay: 2.2 FLA–3.5 LRA @ 120 VAC
Circulator Relay: 14.5 FLA–25.0 LRA @ 120 VAC
Flame Current Requirements:
Minimum current to insure flame detection: 1 µa DC*
Maximum current for non-detection: 0.1 µa DC*
Maximum allowable leakage resistance: 100 M ohms
*Measured with a DC microammeter in the flame probe lead
TIMING SPECIFICATIONS
(All times are in seconds, unless noted otherwise
Event Denition 50M56-743
Pre-Purge
The period of time intended to allow for the dissipation of any unburned
gas or residual products of combustion at the beginning of a furnace
operating cycle prior to initiating ignition
30
Trial for Ignition
Period (TFI)
The period of time between initiation of gas flow and the action to
shut off the gas flow in the event of failure to establish proof of the
supervised ignition source or the supervised main burner flame.
4
Ignition Activation
Period (IAP)
The period of time between energizing the main gas valve and
deactivation of the ignition means prior to the end of TFI
2
Retries
The additional attempts within the same thermostat cycle for ignition
when the supervised main burner flame is not proven within the first
trial for ignition period.
2 times
Recycles
The additional attempts within the same thermostat cycle for ignition
after loss of the supervised ignition source or the supervised main
burner flame.
3
Valve Sequence
Period
Valve sequence period equals 4 seconds trial for ignition period x
(1 initial try + 2 retries) + 12 seconds.
12
Interpurge
The period of time intended to allow for the dissipation of any unburned
gas or residual products of combustion between the failed trial for
ignition and the retry period.
60
Post-Purge
The period of time intended to allow for the dissipation of any unburned
gas or residual products of combustion at the end of a furnace burner
operating cycle. Post-purge begins at the loss of flame sense.
25
Lockout Time
ANSI standard rated module timing.
275
Heat Delay-To-Fan-On
The period of time between proof of the supervised main burner flame
and the activation of the blower motor at Heat speed.
30
Heat Delay-To-Fan-Off*
The period of time between the loss of a call for heat and the
deactivation of the blower motor at Heat speed.
100/150*
Cool Delay-To-Fan-On
The period of time after a thermostat demand for cool before energizing
the circulator blower motor at Cool speed.
6
Cool Delay-To-Fan-Off*
The period of time between the loss of a call for cool and the
deactivation of the blower motor at Cool speed.
45
Ignitor Warm-up
(1st 64 attempts)
The length of time allowed for the igniter to heat up prior to the initiation
of gas flow.
17
Maximum Ignitor
Warm-up
In the event of a retry, the warm-up time will be increased by one
second, up to a maximum of 19 seconds, and locked at that duration
19
Auto Reset
After one (1) hour of internal or external lockout, the control will auto-
matically reset itself and go into an auto restart purge for 60 seconds.
60 minutes
Electronic Air Cleaner Ye s
*This time will vary depending on option switch position. The control is factory set at 150 seconds HEAT
delay-to-fan-off. See OPERATION section for further information
OPERATING TEMPERATURE RANGE:
-40° to 176°F (-40° to 80°C)
HUMIDITY RANGE:
MOUNTING:
Surface mount multipoise
Timing Specs: (@ 60 Hz)
maximum
Flame Establishing Time: 0.8 sec
Flame Failure Response Time: 2.0 sec
Gases Approved: Natural, Manufactured, Mixed, Liquified
Petroleum, and LP Gas Air Mixtures are all approved for use.
3
MOUNTING AND WIRING
All wiring should be installed by a qualified heating and air
conditioning contractor or licensed electrician, according to
local and national electrical codes and ordinances.
The control must be secured to an area that will experience a
minimum of vibration and remain below the maximum ambient
temperature rating of 176°F. The control is approved for
minimum ambient temperatures of -40°F.
When mounting the control, any orientation is acceptable.
Refer to the wiring diagram and wiring table when connecting
the 50M56-743 control to other components of the system.
UL approved, 105°C rated 18 gauge, stranded, 2/64” thick
insulation wire is recommended for all low voltage safety circuit
connections.
UL approved 105°C rated 16 gauge min., stranded, 4/64”
thick insulation wire is recommended for all line voltage
connections.
After installation or replacement, follow appliance manufacturer’s
recommended installation or service instructions to ensure
proper operation.
Do not short out terminals on gas valve or primary
control. Short or incorrect wiring may damage the
thermostat.
CAUTION
!
WARNING
!
FIRE HAZARD
• Donotexceedthespeciedvoltage.
• Replaceexistingcontrolwithexactmodeland
dash number.
• Protectthecontrolfromdirectcontactwithwater
(dripping, spraying, rain, etc.).
• Ifthecontrolhasbeenindirectcontactwith
water, replace the control.
• Labelallwiresbeforedisconnectionwhenserv-
icing controls. Wiring errors can cause improper
and dangerous operation.
• Routeandsecurewiringawayfromame.
SHOCK HAZARD
• Disconnectelectricpowerbeforeservicing.
• Ensureproperearthgroundingofappliance.
• Ensureproperconnectionoflineneutralandline
hot wires.
EXPLOSION HAZARD
• Shutoffmaingastoapplianceuntilinstallation
is complete.
INSTALLATION
4
WIRING
TH
TR
MV HI
MV COM
MV LO
GND
HLO
HLI
PSO
PSI
C
R
G
W
Y
Y
W
G
R
THERMOSTAT
2 STAGE
GAS
VALVE
HIGH LIMIT
(N. C.)
ROLLOUT
(N. C.)
AUX. HIGH
LIMIT (N. C.)
PRESSURE SWITCH (N. O.)
COMPRESSOR
CONTACTOR
ELECTRONIC
AIR CLEANER
CIRCULATOR
BLOWER
50M56
24 VAC
120 VAC
24 VAC CLASS II
TRANSFORMER
HOT
(LINE)
NEUTRAL
(LINE)
FS
FLAME
SENSOR
PROBE
TH TR
RO OUT
RO IN
TYPICAL SYSTEM WIRING DIAGRAM
Low Voltage (24 VAC)
Line Voltage (120 VAC)
LEGEND
N. C. = Normally closed switch
N. O. = Normally open switch
1 STAGE
GAS
VALVE
[4-Pin Connector]
[12-Pin Connector]
IGNITOR
INDUCER
IGN
IGN-N
IND
IND-N
LINE N
XFMR N
EAC N
CIR N
PARK
EAC
XFMR
LINE
PARK
HI HEAT
LO HEAT
COOL
12-Pin Connector
HLO
PSO
HLI
PSI
GND
TH
TR
MV
LO
RO
OUT
RO
IN
MV
COM
MV
HI
4-Pin Connector
IND
IGN
IND
N
IGN
N
5
50M56
TERMINAL
TERMINAL
TYPE
SYSTEM COMPONENT
CONNECTION
TYPICAL SYSTEM WIRING TABLE
†
Maximum recommended flame probe wire length is 36 inches.
low voltage thermostat W terminal (or equivalent)
low voltage thermostat G terminal (or equivalent)
low voltage thermostat R terminal (or equivalent)
low voltage thermostat Y terminal (or equivalent)
(2nd wire from Y terminal goes to 24 VAC HOT side of
compressor contactor coil)
24 VAC COMMON side of compressor contactor coil
high limit OUTPUT
gas valve first stage
24 VAC transformer (low voltage HIGH side)
pressure switch OUTPUT
rollout switch OUTPUT
24 VAC transformer (low voltage COMMON side)
high limit INPUT
MUST BE RELIABLY GROUNDED TO CHASSIS
gas valve COMMON
pressure switch INPUT
rollout switch INPUT
gas valve second stage
inducer HOT side
ignitor HOT side
inducer NEUTRAL side
ignitor NEUTRAL side
W
G
R
Y
C
HLO (Pin 1)
MV LO (Pin 2)
TH (Pin 3)
PSO (Pin 4)
RO OUT (Pin 5)
TR (Pin 6)
HLI (Pin 7)
GND (Pin 8)
MV COM (Pin 9)
PSI (Pin 10)
RO IN (Pin 11)
MV HI (Pin 12)
IND (Pin 1)
IGN (Pin 2)
IND-N (Pin 3)
IGN-N (Pin 4)
COOL
LO HEAT
HI HEAT
PARK (2 terminals)
LINE
XFMR
EAC (optional)
CIR N
LINE N
XFMR N
EAC N (optional)
FS
circulator blower COOL SPEED terminal
circulator blower LO HEAT SPEED terminal
circulator blower HI HEAT SPEED terminal
unused terminals
input voltage (120 VAC) HOT side
24 VAC transformer line voltage HOT side
electronic air cleaner HOT side
circulator blower NEUTRAL terminal
input voltage (120 VAC) NEUTRAL side
24 VAC transformer line voltage NEUTRAL side
electronic air cleaner NEUTRAL side
flame sensor probe
†
HLO
PSO
HLI
PSI
GND
TH
TR
MV
LO
RO
OUT
RO
IN
MV
COM
MV
HI
IND
IGN
IND
N
IGN
N
Te rminal
block with
captive
screws
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
WIRING
6
OPERATION
OPTION SWITCHES
The option switches on the 50M56-743 control are used
to determine the length of the heat delay-to-fan-off period,
the mode of operation, and the 2nd stage delay period. The
following illustration shows the options and the selections of
the switch positions. The switches are shown in the factory
default positions.
HEAT MODE
When heat is required, the thermostat will send a call for heat
to the control. This starts the control’s heating sequence. The
ignitor and humidifier (optional) are powered. The ignitor is
powered after the pre-purge period.
Upon initial application of power, the ignitor warm-up time is 17
seconds. The ignitor on-time will then be increased depending
on whether or not flame is achieved. The warm-up time is
limited to a maximum of 19 seconds. During the first 64 warm-
up periods following power-up, the warm-up time may not be
less than 17 seconds.
In the event of a retry, the warm-up time will be increased by
one second and locked in at that duration. Once the warm-up
time is locked, it remains fixed until another call for heat results
in a retry, in which case the warm-up time is again increased
by one second and remains locked.
In the event of two successive retry attempts, the warm-up
time will be unlocked and set to 19 seconds. If flame is then
achieved, the warm-up time will begin adapting again with the
next call for heat. If, however, this third attempt fails to achieve
flame, the control will go into system lockout.
After the ignitor warm-up period, MV LO (first stage) and MV
HI (second stage) are both energized to the gas valve. Flame
must be detected within 4 seconds. If flame is detected, the
30-second HEAT delay-to-fan-on period begins. The circulator
and electronic air cleaner (optional) will also energize at this
time.
1 Stage operation – If the Option Switch MODE (SW1-2) is
set to the 1 STG position, both MV LO and MV HI will remain
energized.
2 Stage operation – If the Option Switch MODE is set to 2
STG, MV HI will de-energize after 5 seconds, leaving MV LO
energized. If the MODE is in the 2 STG position, 2nd STG DLY
(SW1-3) will determine the second stage- on delay as follows:
5 MIN – On call for heat, the 5 minute 2nd stage recognition
timer begins. After the 5-minute delay, the second stage heat
(MV HI) is energized.
*
*
*MODE and 2ND STG DLY for Goodman 50M56-289 only
AUTO – On call for heat, the automatic second stage will
determine the optimum timing between stages for comfort.
Auto will adapt the delay to energize MV HI from instantly to
up to 12 minutes.
When the thermostat is satisfied, the gas valve is de-energized.
After proof of flame loss, the heat delay-to-fan-off period begins
and the inducer blower remains energized to purge the system
for 25 seconds. When the purge is complete, the inducer blower
is de-energized. After the delay-to-fan-off period ends, the
circulator fan and electronic air cleaner are de-energized.
If flame is not detected, both valves are de-energized, the
ignitor is turned off, and the 50M56-743 control goes into the
“retry” sequence. The “retry” sequence provides a 60-second
wait following an unsuccessful ignition attempt (flame not
detected). After this wait, the ignition sequence is restarted
with an additional 1 second of ignitor warm-up time.
If flame is established for more than 10 seconds after ignition,
the 50M56-743 controller will clear the ignition attempt (or
retry) counter. If flame is lost after 10 seconds, it will re-cycle
the ignition sequence.
During burner operation, a momentary loss of power of 50
milliseconds or longer will de-energize the main gas valve.
When power is restored, the gas valve will remain de-energized
and a restart of the ignition sequence will begin immediately.
A momentary loss of gas supply, flame blowout, or a shorted or
open condition in the flame probe circuit will be sensed within
2.0 seconds. The gas valve will de-energize and the control
will restart the ignition sequence. Recycles will begin and the
burner will operate normally if the gas supply returns, or the
fault condition is corrected.
If the control has gone into system lockout, it may be possible
to reset the control by a momentary power interruption of one
second or longer. Refer to SYSTEM LOCKOUT FEATURES.
COOL MODE
In a typical system, a call for cool is initiated by closing the
thermostat contacts. This energizes the 50M56-743 control
and the compressor. The cool delay-to-fan-on period begins.
After the delay period ends, the optional electronic air cleaner
is energized, and the circulator fan is energized at cool
speed. After the thermostat is satisfied, the compressor is de-
energized and the cool mode delay-to-fan-off period begins.
After the delay-to-fan-off period ends, the circulator fan and
electronic air cleaner (optional) are de-energized.
MANUAL FAN ON MODE
If the thermostat fan switch is moved to the ON position, the
circulator fan (low heat speed) and optional electronic air
cleaner are energized. When the fan switch is returned to the
AUTO position, the circulator fan and electronic air cleaner
(optional) are de-energized.
7
SYSTEM LOCKOUT FEATURES
When system lockout occurs, the gas valve is de-energized,
the circulator blower is energized at heat speed, and, if flame
is sensed, the inducer blower is energized. The diagnostic
indicator light will flash or glow continuously to indicate
system status. (System lockout will never override the
precautionaryfeatures.)
To reset the control after system lockout, do one of the
following:
1. Interrupt the call for heat or cool at the thermostat for at
least one second but less than 20 seconds (if flame is
sensed with the gas valve de-energized, interrupting the
call for heat at the thermostat will not reset the control).
2. Interrupt the 24 VAC power at the control for at least one
second. You may also need to reset the flame rollout
sensor switch.
3. After one hour in lockout, the control will automatically
reset itself.
DIAGNOSTIC FEATURES
The 50M56-743 control continuously monitors its own
operation and the operation of the system. If a failure occurs,
the LED will indicate a failure code as shown on page 8. If
thefailureisinternaltothecontrol,theLEDwillstayoff
orash8times.Inthiscase,theentirecontrolshouldbe
replaced,asthecontrolisnoteld-repairable.
Failure codes will flash the LED in the following flash-
pause sequences to indicate failure status (each flash will
last approximately 0.25 seconds, and each pause will last
approximately 2 seconds).
FAULT RECALL
The last five fault codes stored can be displayed on the
diagnostic LED. When the control is in standby mode (no
call for heat or cool), press the FAULT RECALL switch for
approximately two seconds or until the diagnostic LED turns
off. Release the switch and the LED will remain off for two
seconds. Then the fault codes will display beginning with the
most recent fault first with a two second pause between codes.
After the stored fault codes have all displayed, the LED will
remain off for two seconds and then turn on to indicate return
to normal status. While displaying the stored fault codes, the
control will ignore any new call for heat, cool or fan.
FAULT CODE RESET
The stored fault codes can be erased from memory. When
the control is in standby mode (no call for heat or cool), press
the FAULT RECALL switch for five to ten seconds or until
the diagnostic LED begins to rapid flash. When the switch is
released, the LED will turn off for two seconds to indicate the
codes are erased. After two seconds the LED will turn on to
indicate return to normal status. If the switch is held pressed
for over ten seconds the rapid flash will stop and the LED will
be on to indicate return to normal status.
The 50M56-743 has only one serviceable part –an automotive
type fuse, which protects the low voltage transformer from
damage if the output is short-circuited. If the fuse has opened
up, remove whatever caused the short circuit and replace the
fuse with only a 3 Amp automotive type fuse. If the fuse does
not correct the condition, replace the entire 50M56-743 control.
There are no other user serviceable parts.
SYSTEM LOCKOUT AND DIAGNOSTIC FEATURES
HOMEOWNER HELP LINE:1-800-284-2925
White-Rodgers is a business
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
www.white-rodgers.com
www.emersonclimate.com
Red LED
Flash Error/Condition Comments/Troubleshooting
1 External lockout
(exceeded retries)
Failure to sense flame is often caused by carbon deposits on the flame
sensor, a disconnected or shorted flame sensor lead or a poorly grounded
furnace. Carbon deposits can be cleaned with emery cloth. Verify sensor is
not contacting the burner and is located in a good position to sense flame.
Ignitor must be positioned to light the gas immediately when the valve
opens. If the ignitor has been replaced, verify hot spot position has not
changed.
Check sensor lead for shorting and verify furnace is grounded properly.
Verify gas supply to valve, gas valve in "On" position and appliance
lighting properly. Verify flame reaches flame sensor during ignition
attempts and gas pressures are correct.
2 Pressure switch stuck
closed
Pressure switch stuck closed. Check switch function, verify inducer is
turning off. Refer to wiring diagram, terminals PSI / PSO.
3 Pressure switch stuck
open
Check pressure switch function and tubing. Verify inducer is turning on
and pulling sufficient vacuum to engage switch. Refer to wiring diagram,
terminals PSI / PSO.
4 Open high temperature
limit switch
Verify continuity through limit switch circuit. Refer to wiring diagram
terminals, HLI / HLO.
5 Flame sensed with gas
valve
de-energized
Verify the gas valve is operating and shutting down properly. Flame in
burner assembly should extinguish promptly at the end of the cycle. Check
orifices and gas pressure.
6 Open rollout switch Verify continuity through rollout switch circuit. Refer to wiring diagram
terminals, RO IN / RO OUT.
7 Low flame sense current Low flame sense current is often caused by carbon deposits on the flame
sensor, a poorly grounded furnace or a mis-aligned flame sense probe.
Carbon deposits can be cleaned with emery cloth.
Check or improve furnace and module ground. Verify sensor is located in
or very near flame as specified by the appliance manufacturer. Refer to
wiring diagram FS terminal and GND.
8 Ignitor relay fault This flash code does not indicate a broken, disconnected or shorted
ignitor. It indicates the ignitor relay contacts on the ignition module are not
functioning properly. Replace the ignition module.
Rapid Flash Reversed polarity Verify the control and furnace are properly grounded. Check and reverse
polarity (primary or secondary) if incorrect.
Continuous On Normal operation No fault
Off Control failure Verify power to the control, replace control if power is at the control and no
lit Red LED
TROUBLESHOOTING
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
Emerson 50M56-743 Direct Replacement Furnace Control for Goodman Multi Speed Nitride Ignition Integrated Furnace Control User manual
- Type
- User manual
- This manual is also suitable for
Ask a question and I''ll find the answer in the document
Finding information in a document is now easier with AI
Related papers
Other documents
-
ICM Controls ICM256 Application/Install Guide
-
White Rodgers 50M56U-843 User manual
-
-
-
-
-
ICM Controls ICM2913 Installation guide
-
-
-